Update readne

README.md

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 # errors [![Travis-CI](https://travis-ci.org/pkg/errors.svg)](https://travis-ci.org/pkg/errors) [![GoDoc](https://godoc.org/github.com/pkg/errors?status.png)](http://godoc.org/github.com/pkg/errors)
+
+Hello! 
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+Read the [presentation](https://t.co/GGPr7HJZYR) to see what the big deal is.